“…In the US, the prevalence of current waterpipe smoking (past 30 days) increased among middle (1.0-2.5 %) and high school (4.1-9.4 %) students from 2011 to 2014, and waterpipe use has become as common as cigarette smoking among students (Arrazola et al 2015). In Canada, current waterpipe smoking increased from 4.0 % in 2010 to 5.4 % in 2012/2013 among high school students (grade 9-12) (Czoli et al 2013;Minaker et al 2015). Waterpipe smoking is particularly popular in Eastern Mediterranean countries, such as Lebanon (36.9 %), West Bank (32.7 %), Latvia (22.7 %), the Czech Republic (22.1 %), Estonia (21.9 %), Syria (20.1 %), and Jordan (18.9 %) (Jawad et al 2015a).…”